Roll compaction molding device

Abstract

To suppress reduction in density at the end of a molding by resistance of a confinement plate.SOLUTION: A roll compaction molding device comprises a pair of molding rolls 22 arranged at predetermined intervals in alignment along an axial direction, a rotating device 30 that rotates at least one of the pair of molding rolls 22, a supply device 40 that delivers a powdered material 1 toward the pair of molding rolls 22, a first confinement plate 50L extending in the row direction of the molding rolls 22 and in the material 1 feed direction U-D, in contact with the pair of molding rolls 22 from the upstream side U in the feed direction U-D, a second confinement plate 50R extending in the row direction and the feed direction U-D, in contact with the pair of molding rolls 22 from the upstream side U in the feed direction U-D and arranged opposite the first confinement plate 50L across the material supply point P1 of the supply device 40, and a vibrating device 70 that vibrates the first confinement plate 50L and the second confinement plate 50R.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a roll compaction molding apparatus. [Background technology]

[0002] For example, Patent Document 1 discloses a dry granulator (roll compaction molding device) equipped with a conveying screw for conveying raw material, a pair of upper and lower raw material compression rolls (molding rolls), and a pair of upper and lower seals and side seals (stop plates) that form a closed space surrounding the raw material biting portions of the pair of raw material compression rolls. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-000955 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the knowledge of the inventors of the present application, in a roll compaction molding device, the supply of molding material to the molding rolls near each stopper may be insufficient, resulting in a low density of the molded product. [Means for solving the problem]

[0005] The roll compaction molding device disclosed herein comprises a pair of forming rolls arranged with a predetermined gap between them and aligned in their axial directions, a rotating device that rotates at least one of the pair of forming rolls, a supplying device that feeds powdered material toward the pair of forming rolls, a first stop plate that extends in the alignment direction of the forming rolls and in the feed direction of the material and contacts the pair of forming rolls from the upstream side of the feed direction, a second stop plate that extends in the alignment direction and the feed direction and contacts the pair of forming rolls from the upstream side of the feed direction and is positioned opposite the first stop plate across the point where the material is supplied by the supplying device, and a vibrating device that vibrates the first stop plate and the second stop plate.

[0006] The roll compaction molding device described above promotes the supply of molding material to the molding rolls, thereby preventing a decrease in the density of the molded product. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a schematic front view of a roll compaction molding device. [Figure 2] FIG. 2 is a schematic side view of a roll compaction molding device. DETAILED DESCRIPTION OF THE INVENTION

[0008] One embodiment of the present disclosure will be described in detail below with reference to the drawings. In the following drawings, components and parts that perform the same function are denoted by the same reference numerals. Furthermore, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relationships. The directions of up, down, left, right, front, and rear are represented by arrows U, D, L, R, F, and Rr, respectively, in the drawings. Here, the directions of up, down, left, right, front, and rear are defined merely for the convenience of explanation and do not limit the present invention unless otherwise specified.

[0009] [Configuration of roll compaction molding equipment] FIG. 1 is a schematic front view of a roll compaction molding apparatus (hereinafter simply referred to as the molding apparatus) 10. FIG. 2 is a schematic side view of the molding apparatus 10. However, FIG. 1 illustrates a state in which a front molding roll 21 and a front wall 60F (both of which will be described later) are removed. The molding apparatus 10 is an apparatus that compresses a powdered material 1 to form it into a sheet. Here, the material 1 contains ceramic powder and a binder. The binder is made of resin. In this embodiment, the material 1 is fired after molding to form a porous ceramic body. The material 1 further contains a pore-forming material that forms voids. However, the components of the material 1 are not particularly limited.

[0010] As shown in FIGS. 1 and 2, the molding apparatus 10 includes a pair of forming rolls 21 and 22, a rotating device 30, a material supplying device 40, a pair of stoppers 50L and 50R, a front wall 60F and a rear wall 60Rr, and a vibrating device 70. Each of the pair of forming rolls 21 and 22 is cylindrical. The pair of forming rolls 21 and 22 compresses the material 1 with their respective outer peripheral surfaces 21a and 22a to form the material 1 into a sheet. The pair of forming rolls 21 and 22 are arranged with a predetermined gap between them and aligned in the axial direction. By supplying the material 1 into the gap between the pair of forming rolls 21 and 22 and rotating the pair of forming rolls 21 and 22, the material 1 is compressed and formed into a sheet having a thickness corresponding to the gap between the pair of forming rolls 21 and 22.

[0011] In the following description, the axial direction of the forming rolls 21 and 22 is defined as the left-right direction of the forming apparatus 10, and the arrangement direction of the forming rolls 21 and 22 is defined as the front-rear direction of the forming apparatus 10. The axes 21x and 22x of the forming rolls 21 and 22 extend substantially horizontally in the left-right direction. The axis 21x of the forming roll 21 and the axis 22x of the forming roll 22 are aligned in the front-rear direction.

[0012] One of the forming rolls, 22, is configured to be movable in parallel in the front-to-rear direction. By moving the forming roll 22 in the front-to-rear direction, the distance between the forming rolls 21 and 22 can be changed. This makes it possible to change the thickness of the formed sheet 2. The movable forming roll may be the forming roll 21, or both the forming rolls 21 and 22.

[0013] The rotation device 30 rotates at least one of the pair of forming rolls 21, 22. In this embodiment, the rotation device 30 rotates both of the pair of forming rolls 21, 22 in synchronization. However, the rotation device 30 may be configured to rotate only one of the pair of forming rolls 21, 22. In that case, the other forming roll rotates passively. The rotation device 30 includes a drive motor 31 and a transmission mechanism 32 that transmits the rotation of the drive motor 31 to the pair of forming rolls 21, 22. The transmission mechanism 32 includes, for example, a chain that is engaged with the drive motor 31 via a gear and is also engaged with the forming rolls 21, 22 via gears. However, the configuration of the transmission mechanism 32 is not limited thereto.

[0014] The supply device 40 feeds the material 1 toward the pair of forming rolls 21, 22. In this example, the supply device 40 is disposed above the pair of forming rolls 21, 22, and drops the material 1 onto the pair of forming rolls 21, 22. The supply device 40 may be configured separately from or integral with a mixer that mixes and stirs the material 1. Any known powder supply device can be used as the supply device 40, without any particular limitations. In this example, the direction in which the supply device 40 feeds the material 1 is downward.

[0015] The pair of stop plates 50L, 50R consists of a left stop plate 50L and a right stop plate 50R. The left stop plate 50L extends in the arrangement direction of the pair of forming rolls 21, 22 and in the feed direction of the material 1. Here, the left stop plate 50L extends in the front-to-back direction and the up-and-down direction. The left stop plate 50L is configured in a flat plate shape. The left stop plate 50L contacts the pair of forming rolls 21, 22 from the upstream side in the feed direction of the material 1. Here, the left stop plate 50L is disposed above the pair of forming rolls 21, 22, and its lower edge contacts the outer peripheral surfaces 21a, 22a of the pair of forming rolls 21, 22.

[0016] The right septum 50R also extends in the arrangement direction of the pair of forming rolls 21, 22 (here, the front-to-back direction) and in the feed direction of the material 1 (here, the up-and-down direction). The right septum 50R is also configured as a flat plate. The right septum 50R contacts the pair of forming rolls 21, 22 from the upstream side in the feed direction of the material 1. In this case, the right septum 50R is disposed above the pair of forming rolls 21, 22, and its lower edge contacts the outer peripheral surfaces 21a, 22a of the pair of forming rolls 21, 22. As shown in FIG. 1 , the right septum 50R is disposed opposite the left septum 50L across the supply point (drop point) P1 of the material 1 by the supply device 40. The left septum 50L and the right septum 50R are disposed side by side in the left-right direction. The left septum 50L and the right septum 50R are configured symmetrically and disposed approximately parallel to each other.

[0017] As shown in Fig. 2, the right stopper 50R has a pair of curved portions 51 that are curved to fit along the outer peripheral surfaces 21a, 22a of the pair of forming rolls 21, 22, respectively. The pair of curved portions 51 form the lower edge of the right stopper 50R. The pair of curved portions 51 are connected to form a downwardly convex apex. Although not shown in the figure, the left stopper 50L is configured similarly to the right stopper 50R.

[0018] As shown in FIG. 2, the front wall 60F and the rear wall 60Rr are disposed above the pair of forming rolls 21, 22. The front wall 60F and the rear wall 60Rr are disposed opposite each other in the arrangement direction (front-rear direction) of the pair of forming rolls 21, 22, sandwiching the supply point (dropping point) P1 of the material 1 therebetween. The front wall 60F and the rear wall 60Rr extend in the axial direction (left-right direction) of the pair of forming rolls 21, 22 and in the feed direction (up-down direction) of the material 1, respectively. A pair of stop plates 50L, 50R are attached to the front wall 60F and the rear wall 60Rr. Here, the pair of stop plates 50L, 50R are fixed at their upper ends and free at their lower ends. However, the positions at which the pair of stop plates 50L, 50R are fixed are not particularly limited.

[0019] The front wall 60F and the rear wall 60Rr define the front-to-rear boundary (the direction in which the forming rolls 21 and 22 are arranged) of the space into which the material 1 is introduced. The pair of stoppers 50L and 50R define the left-to-right boundary (the axial direction of the forming rolls 21 and 22) of the space into which the material 1 is introduced. The pair of stoppers 50L and 50R prevent the material 1 from scattering to the left or right. The pair of stoppers 50L and 50R also determine the width of the sheet 2 to be formed. The pair of stoppers 50L and 50R are configured to be movable left and right between the front wall 60F and the rear wall 60Rr. By moving the pair of stoppers 50L and 50R left and right, the distance between the left stopper 50L and the right stopper 50R can be changed. This allows the width of the sheet 2 to be formed to be changed.

[0020] In a roll compaction molding device, the molding material near a pair of stop plates aligned in the axial direction of the molding rolls is more difficult to feed to the molding rolls due to the resistance of the stop plates than the molding material located midway between the two stop plates. As a result, the supply of molding material to the molding rolls near the two stop plates may be insufficient, resulting in a low density of the molded product. The molding device 10 according to this embodiment is configured to suppress such a decrease in density of the molded product (sheet 2).

[0021] As shown in FIG. 1 , the left and right separators 50L and 50R each include a main body 50A extending in the direction of arrangement of the pair of forming rolls 21 and 22 (front-to-back direction) and in the feed direction of the material 1 (up-and-down direction). A surface 50B is provided on the surface of the main body 50A facing the other separator 50R or 50L. The surface 50B has a lower coefficient of friction than the main body 50A. The surface 50B reduces the surface resistance of the left and right separators 50L and 50R, facilitating the feed of the material 1. Here, the surface 50B is made of a low-friction sheet attached to the main body 50A. However, the surface 50B is not limited to this. The surface 50B may be formed, for example, by painting or spraying a friction-reducing substance.

[0022] The vibrating device 70 vibrates the left septum 50L and the right septum 50R. By vibrating the left septum 50L and the right septum 50R, the vibrating device 70 makes it difficult for the material 1 to remain on the left septum 50L and the right septum 50R, and makes it easier for the material 1 near the left septum 50L and the right septum 50R to be sent between the forming rolls 21 and 22.

[0023] As shown in FIG. 1, in this embodiment, the vibration device 70 includes a left vibrator 70L that vibrates the left septum 50L and a right vibrator 70R that vibrates the right septum 50R. However, the left septum 50L and the right septum 50R may be connected and vibrated by a single vibrator. Here, the left vibrator 70L and the right vibrator 70R have the same configuration. Various known vibrators can be used for the left vibrator 70L and the right vibrator 70R without any particular restrictions.

[0024] Here, the left vibrator 70L is in contact with a portion lower than half of the left dam 50L. The left vibrator 70L applies vibrations to a portion lower than half of the left dam 50L. This causes the lower portion of the left dam 50L to vibrate, making it easier for the material 1 near the pair of forming rolls 21, 22 to fall between the forming rolls 21 and 22. However, the left vibrator 70L may also be in contact with a portion higher than half of the left dam 50L. The right vibrator 70R is also in contact with a portion lower than half of the right dam 50R.

[0025] The vibration device 70 vibrates the left and right septa 50L and 50R so that they move back and forth in the axial direction of the pair of forming rolls 21 and 22. The left vibrator 70L vibrates the left septa 50L in the left-right direction. The right vibrator 70R vibrates the right septa 50R in the left-right direction. The left and right vibrators 70L and 70R are arranged so that the vibration direction is approximately parallel to the axial direction of the forming rolls 21 and 22.

[0026] The vibration frequencies of the left vibrator 70L and the right vibrator 70R are set, for example, between 30 Hz and 100 Hz. According to the inventor's knowledge, the natural vibration frequency of the stoppers 50L and 50R is determined by the material and length of the stoppers 50L and 50R, the mounting positions of the left vibrator 70L and the right vibrator 70R, and the vibration frequencies of the left vibrator 70L and the right vibrator 70R are adjusted to an appropriate frequency to match this natural vibration frequency. According to the inventor's knowledge, when the vibration frequencies of the left vibrator 70L and the right vibrator 70R are adjusted to match the natural vibration frequency of the stoppers 50L and 50R, the stoppers 50L and 50R vibrate around their fixed upper ends as axes, effectively assisting in the feeding of the material 1. Furthermore, when the vibration frequencies of the left vibrator 70L and the right vibrator 70R are adjusted to match the natural vibration frequencies of the stoppers 50L and 50R, the amplitude of the stoppers 50L and 50R is maximized. On the other hand, if the vibration frequencies of the left vibrator 70L and the right vibrator 70R are not adjusted to match the natural vibration frequencies of the stoppers 50L and 50R, only the areas of the stoppers 50L and 50R near where the left vibrator 70L and the right vibrator 70R are attached will vibrate, weakening the auxiliary effect of feeding the material 1. Furthermore, if the amplitude of the left vibrator 70L and the right vibrator 70R is too large, the powder in the material 1 will form clumps (typically bridges) due to the vibration. Therefore, the output of the left vibrator 70L and the right vibrator 70R is adjusted so that the amplitude does not become too large.

[0027] In the forming device 10, the material 1 dropped at the supply point P1 by the supply device 40 is rolled by a pair of rotating forming rolls 21, 22. By this rolling, the material 1 is continuously formed into a sheet 2 having a thickness corresponding to the gap between the pair of forming rolls 21, 22 and a width corresponding to the distance between the pair of stoppers 50L, 50R.

[0028] [Effects of the roll compaction molding device] The following describes the effects that can be achieved by the molding device 10 according to this embodiment.

[0029] The molding device 10 of this embodiment is equipped with a pair of forming rolls 21, 22 arranged with a predetermined distance between them and aligned in the axial direction, a rotating device 30 that rotates at least one of the pair of forming rolls 21, 22, a supplying device 40 that sends material 1 toward the pair of forming rolls 21, 22, a left stop plate 50L that extends in the alignment direction of the pair of forming rolls 21, 22 and in the feed direction of the material 1 and contacts the pair of forming rolls 21, 22 from the upstream side of the feed direction, a right stop plate 50R that extends in the alignment direction of the pair of forming rolls 21, 22 and in the feed direction of the material 1 and contacts the pair of forming rolls 21, 22 from the upstream side of the feed direction and is arranged opposite the left stop plate 50L across the supply point P1 of the material 1 by the supplying device 40, and a vibration device 70 that vibrates the left stop plate 50L and the right stop plate 50R.

[0030] According to the forming apparatus 10 of this embodiment, the vibration device 70 vibrates the left and right stop plates 50L and 50R, thereby preventing the material 1 from stagnation due to the resistance of the stop plates 50L and 50R. Therefore, a shortage of the supply of the material 1 to the forming rolls 21 and 22 is prevented even near the left and right stop plates 50L and 50R. As a result, a decrease in the density of the sheet 2 at both ends in the width direction (left and right direction) of the sheet 2 can be prevented.

[0031] In this embodiment, the vibration device 70 vibrates the left and right seals 50L and 50R so that they reciprocate in the axial direction (here, the left-right direction) of the pair of forming rolls 21, 22. With this configuration, the gap between the left seal 50L and the pair of forming rolls 21, 22 and the gap between the right seal 50R and the pair of forming rolls 21, 22 do not expand or contract due to vibration. Therefore, spillage of the material 1 between the left seal 50L and the pair of forming rolls 21, 22 and between the right seal 50R and the pair of forming rolls 21, 22 can be suppressed.

[0032] In this embodiment, the left and right separators 50L and 50R each include a main body 50A extending in the direction in which the pair of forming rolls 21 and 22 are arranged (front-to-back) and in the feed direction of the material 1 (up-and-down). The main body 50A is provided on the surface of the main body 50A facing the other separator 50R or 50L. The surface 50B has a lower coefficient of friction than the main body 50A. This configuration reduces the resistance of the left and right separators 50L and 50R. This further reduces the insufficient supply of material 1 to the forming rolls 21 and 22 near the left and right separators 50L and 50R. As a result, a decrease in the density of the sheet 2 at both ends of the sheet 2 in the width direction (left-right direction) can be more reliably prevented.

[0033] [Other embodiments] Although the present invention has been described in detail above using specific embodiments, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and alterations of the above-described embodiments.

[0034] For example, in the above-described embodiment, the vibration device 70 includes the vibrators 70L and 70R that vibrate themselves. However, the vibration device is not limited to a device that vibrates itself, as long as it vibrates the septum. The vibration device may be configured to vibrate the septum by, for example, hitting or rubbing the septum.

[0035] This specification includes the following items 1 to 3. The following items 1 to 3 are not limited to the above-described embodiments.

[0036] Section 1: a pair of forming rolls arranged with a predetermined gap therebetween and aligned in the axial direction; a rotating device that rotates at least one of the pair of forming rolls; a supply device for feeding powdered material toward the pair of forming rolls; A first stopper plate extending in the arrangement direction of the forming rolls and the feed direction of the material and contacting the pair of forming rolls from the upstream side of the feed direction; a second stop plate extending in the arranging direction and the feeding direction, contacting the pair of forming rolls from the upstream side in the feeding direction, and arranged opposite to the first stop plate across the supply point of the material by the supply device; A vibration device that vibrates the first and second dams, Roll compaction molding equipment.

[0037] Section 2: The vibration device vibrates the first and second stop plates so as to reciprocate in the axial direction of the pair of forming rolls. Item 1. The roll compaction molding apparatus according to item 1.

[0038] Section 3: The first and second dams each have: a main body portion extending in the arrangement direction and the feed direction; a surface portion provided on a surface of the main body portion facing the other stopper plate, the surface portion having a smaller friction coefficient than the main body portion; Item 1 or 2. The roll compaction molding apparatus according to item 1 or 2. [Explanation of symbols]

[0039] 1 material 10 Molding equipment 21, 22 Forming roll 30 Rotating Device 40 Feeding device 50L Left siding (first siding) 50R Right Seki Board (Second Seki Board) 50A main body 50B Surface part 70 Vibration device 70L Left Vibrator 70R Right Vibrator

Claims

1. a pair of forming rolls arranged with a predetermined gap therebetween and aligned in the axial direction; a rotating device that rotates at least one of the pair of forming rolls; a supply device for feeding powdered material toward the pair of forming rolls; a first stopper plate extending in the arrangement direction of the forming rolls and the feed direction of the material and contacting the pair of forming rolls from the upstream side of the feed direction; a second stopper extending in the arranging direction and the feeding direction, contacting the pair of forming rolls from the upstream side in the feeding direction, and disposed opposite the first stopper across a supply point of the material by the supply device; A vibration device that vibrates the first and second dams, Roll compaction molding equipment.

2. the vibration device vibrates the first and second stop plates so as to reciprocate in the axial direction of the pair of forming rolls. The roll compaction molding device according to claim 1 .

3. The first and second dams each have: a main body portion extending in the arrangement direction and the feed direction; a surface portion provided on a surface of the main body portion facing the other stopper plate, the surface portion having a smaller friction coefficient than the main body portion; The roll compaction molding device according to claim 1 .

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